Metal detector



FIG. 1 is a perspective view of an ornamental design for a metal detector, showing a portion of a top side of the metal detector.

FIG. 2 is a perspective view of the design for the metal detector, showing a portion of a bottom side of the metal detector.

FIG. 3 is a front view of the design for the metal detector.

FIG. 4 is a back view of the design for the metal detector.

FIG. 5 is a right side view of the design for the metal detector.

FIG. 6 is a left side view of the design for the metal detector.

FIG. 7 is a top view of the design for the metal detector; and,

FIG. 8 is a bottom view of the design for the metal detector. 

CLAIM The ornamental design for a metal detector, substantially as shown and described. 